Pistol cabiber 9×19
Glock Magazine compatible
Binary trigger (Franklin?)
7.5 inch upper
Give me some ideas on brands, styles, changes to the above list.
Yes, I know I just described an SBR. Yes, I know it requires a stamp. Yes, I know it will take a while. Yes, I know a “Sig Brace” can be shouldered and does not require a stamp. Save me the lecture.